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Flux switching electric machine
Szabó, Hugo ; Klíma, Petr (referee) ; Ondrůšek, Čestmír (advisor)
The goal of this thesis is to create a literature search about a rotating electrical machine with switching of magnetic flux, to explain its construction concept and its operating behavior, to create an initial concept of generator, calculate chosen construction with finite element method analysis and to compare analysis results with analytical design. To create a concept of the generator one of available designing procedures will be used.
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Design of high-speed induction motor
Svoreň, Jan ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This work deal with troubleshooting of problem parts of high-speed induction machines. Introduction is about conception of induction machines with reference to construction specialities due to high rpm and because machines are fed by inverter. Next part is focused to design problems. A classical induction machine was measured to determination change of various losses in classic and high-speed induction machines. The computation of laboratory sample high-speed motor was specified for calculation of effective resistance and leakage reactance of solid-steel rotor with copper layer. The results of numerical calculation were validated by using finite elements method and machine design was adjusted for improving operation characteristic.
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Noise sources of single phase induction motor
Knap, Zdeněk ; Janda, Marcel (referee) ; Ondrůšek, Čestmír (advisor)
This bachelor’s thesis is aimed to find sources of acoustic noise on a single-phase induction motors. Main focus is noise of electromagnetic origin and its actual connection to motor parameters. Noise frequencies are the key subjects of this work. Based on this literature research, it includes analysis of real single-phase induction motor in mathematical software MATLAB. In the end, there is a summary of rules for reduction of the noise caused by electromagnetic fields and list of dangerous frequencies for analyzed motor.
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Model of a diesel-generator
Suchomel, Vít ; Ondrůšek, Čestmír (referee) ; Bárta, Jan (advisor)
This work deals with principles and methods of drive-train regulation. Furthermore it deals with simulation of drive train via Simulink in a program Matlab. The work is done in cooperation with Siemens Drasov. A created model will be used as an educational model for employees of company. The model will allow better and more graphic education. In the beginning part is drive-train generally descripted. Next part is especially about a synchronous generator. This work also explains a working principle of generator and excitation. There is a cooperation of generator with electrical network described and transformation of synchronous generator into a model of general electric machine showed, substitute scheme is in d, q coordinates deduced in the next part. There are simulations of different states of generator solved in a practical part of the work. At first there is simulation of generator’s load change by using the created model done and further there are simulations of short circuits in stator winding realized. Finally there are simulations of connecting the synchronous generator into infinite bus for ideal and unfavorable conditions done. All simulation models include lots of oscilloscopes, which allow time courses to display, currents, shaft’s revolutions, torques and so on.
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Dynamic model and deexcitation of brushless synchronous generator
Chrobák, Petr ; Huzlík, Rostislav (referee) ; Ondrůšek, Čestmír (advisor)
This master thesis is focused on the synchronous generator mathematical model analysis. Based on the analysis are compiled mathematical models of main generator and exciter cooperating in brushless synchronous generator excitation system. Mathematical models of both machines are based on system of differential equations and their validity is verified in Matlab-Simulink. The master thesis is devided into three main parts. First part is focused on the derivation of differential equations to describe the behavior of electrical quantities of machines. In the second part are compiled and simulated mathematical models of both synchronous machines in Matlab-Simulink. The correctness of models are verified by approximate analytical calculations of selected steady and dynamic states. The last part is focused on design and simulation of concept for main generator rapid field winding deexcitation in brushless synchronous genereator excitation system.
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Mechanical Torque Analysis of Induction Machine Based on Magnetic Circuit Saturation
Skalka, Miroslav ; Bendl,, Jiří (referee) ; Voženílek, Petr (referee) ; Ondrůšek, Čestmír (advisor)
e main goal of this thesis is mechanical torque analysis of induction machine based on magnetic circuit saturation, oversaturated areas classification and the possibility of oversaturated areas reduction of their influence on machine properties. Whole problem is solved by finite element method in ANSYS program. Work is divided into the description and creating of electromagnetic model, a method of the induction machine equivalent circuit parameters determination, the electromagnetic field calculation by finite element method, experimental measurement using LabVIEW program with measurement accessories (PCIe card National Instruments), data processing program in DIAdem, results analysis of calculations in terms of magnetic circuit saturation, the influence of magnetic circuit material based on electromagnetic field distribution and the magnetic flux density along the air gap including spectral analysis using MATLAB and the electromagnetic torque and its parasitic torque components calculation.
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Reluctance machine with permanent magnet on rotor
Kubín, Tomáš ; Mach, Martin (referee) ; Ondrůšek, Čestmír (advisor)
This master’s thesis is focuses on the reluctance motor, especially on the design of the rotor. It shows the development of the construction of rotors of reluctance motors. Furthermore, it shows the principle of reluctance machine and its basic mathematical description and the principle of improving the machine parameters by inserting permanent magnets into the rotor. It offers an overview of patents available from 2000 to present. Also it deals with the design of the rotor with permanent magnets for stator of induction motor.
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Design of Vibration Energy Harvester with Using of Non-linear Characteristics
Rubeš, Ondřej ; Ondrůšek, Čestmír (referee) ; Hadaš, Zdeněk (advisor)
This thesis is focused on design of piezoelectric energy harvester with additional nonlinear stiffness. Linear generator has very narrow resonance frequency bandwidth. It makes the resonance mechanism very sensitive to tuning up of the resonance frequency and it can be tuned only for one narrow vibration peak. The main idea for using of the vibration energy harvester with nonlinear stiffness is to make resonance frequency bandwidth wider, so the generator will be useable for more excitation frequencies. In this thesis is used generator Midé V21BL and additional nonlinear stiffness is realized with permanent magnets.
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